Comparison

Plasmids X vs RayCrest Lab Calculator

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Plasmids X

Design, create, and analyze custom DNA plasmids with this intuitive molecular genetics tool. Supports importing, editing, and sharing plasmids, with powerful in silico analysis features for researchers and students.

Highlights
  • Create plasmids from sequences
  • Import from .dna and Genbank files
  • Edit plasmids by adding features
  • In silico analysis (sequence alignment, PCR, digestion)
  • Share and collaborate on plasmids
Features
Read full description

PlasmidsX is a plasmid editor for iPhone, iPad and Mac. Open your constructs, see them as clear circular and linear maps, read every base with its annotations, and plan restriction digests, all on your device. MAPS AND SEQUENCE • Circular and linear plasmid maps with features, primers and restriction sites. Tap any feature to see its details. • A sequence view with both strands, translations, feature tracks and enzyme sites • Find sequences, select a range by its coordinates and copy exactly what you need ANNOTATE AND ANALYZE • Add, edit, sort and search features and primers • A primer library shared by all your plasmids • Find open reading frames • Restriction analysis with the commercially available enzymes from REBASE, aware of Dam, Dcm and CpG methylation • Digest & Gel: pick enzymes and see the fragments on a virtual agarose gel • Saved versions of every plasmid, so you can go back YOUR LIBRARY • Import GenBank, FASTA, SnapGene (.dna) and ApE files from Files, Mail or any other app • Export FASTA and images of the map and the sequence, or print them • A Home Screen widget with your recent and favorite plasmids • Built for iPhone, iPad and Mac, with keyboard shortcuts, pointer support, Dark Mode, Dynamic Type and VoiceOver PLASMIDSX PRO Viewing, importing, annotating and analyzing are free. A PlasmidsX Pro subscription adds: • Sequence editing: type, paste, cut and delete bases, reverse complement, set the origin • Cloning: restriction and ligation, Gibson Assembly, Golden Gate, Gateway and PCR • Alignment of sequencing reads to your plasmid • BLAST searches and sequence downloads from NCBI • GenBank and SnapGene export PlasmidsX Pro is an auto-renewing subscription, billed monthly or yearly. Payment is charged to your Apple Account when you confirm the purchase. The subscription renews automatically unless you cancel it at least 24 hours before the end of the current period, and your account is charged for the renewal within the 24 hours before the period ends. You can manage or cancel your subscription in your Apple Account settings. PRIVACY PlasmidsX has no account, no ads and no tracking. Your plasmids stay on your device. Data leaves your device only when you ask: a BLAST search sends your query sequence and contact email to NCBI, and a download from NCBI sends the accession number, your contact email and, if you set one, your NCBI API key. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://aminmahpour.com/privacy_plasmids.html

About

RayCrest Lab Calculator

This app assists researchers, students, and lab teams with essential calculations for preparing buffers, solutions, and dilutions. It provides practical guidance for weighing solids, mixing stocks, and titration, with built-in tools for buffer charts, recipes, and protocol timers.

Highlights
  • Buffer preparation guidance
  • Henderson-Hasselbalch recipes
  • Stock mixing and titration
  • Solution and dilution calculations
  • Mass/volume conversions
  • Protocol timers
  • Saved recipes and compounds
Features
Read full description

RayCrest Lab Calculator is a bench-side calculator for researchers, students, and lab teams who prepare buffers, solutions, dilutions, and timed protocols. Turn buffer parameters into practical prep guidance. Choose a buffer, set target pH, concentration, volume, temperature, and preparation preference, then generate steps for weighing solids, mixing stocks, or titration. Built-in tools include: - Buffer charts and filterable buffer selection - Henderson-Hasselbalch buffer recipes - Stock mixing and titration guidance - Solution and dilution calculations - Mass/volume, mole/volume, and molarity conversions - Protocol timers for repeated lab steps - Optional compound lookup and manual molecular weight entry - Saved recipes, compounds, and preferences Designed for iPhone and iPad, RayCrest Lab Calculator keeps everyday lab math organized in one place. Use quick calculations at the bench on iPhone, or the larger iPad layout for planning recipes, viewing buffer ranges, and checking multiple values. Local by default: Saved recipes, compounds, and preferences are stored locally on your device. The app does not include analytics, advertising SDKs, or tracking frameworks. Manual calculators work without online lookup; optional compound search may use network access only when you choose to look up compound information. RayCrest Lab Calculator is a calculation aid for research and educational lab workflows. Always verify units, pH, reagent compatibility, and safety requirements before preparing reagents.

Screenshots

Plasmids X4 screens
RayCrest Lab Calculator4 screens

Verdict

The call

The clearest difference is rating: RayCrest Lab Calculator at 4.7 against Plasmids X's 3.4. RayCrest Lab Calculator also leads on in-app purchases (none vs 14) and iOS requirement (17.0 vs 26.0). On price, ratings volume, update cadence and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Plasmids X sells 14 in-app purchases, starting at $1.99 per month. RayCrest Lab Calculator asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

RayCrest Lab Calculator holds the better App Store score, 4.7 against 3.4. Both are backed by a comparable volume of ratings — 7 and 3 respectively.

UpkeepUpdate frequency

Plasmids X ships an update monthly, RayCrest Lab Calculator every 2 months. The most recent releases landed on October 9, 2026 and October 10, 2026 respectively.

Scorecard4 real differences · 6 level
Plasmids X versus RayCrest Lab Calculator: the parameters behind the verdict, then further details
ParameterPlasmids XRayCrest Lab Calculator
PriceFreeFree
Rating3.4 (7 ratings)4.7 (3 ratings) — better
Positive reviews33.3% of reviews—
Number of ratings7 — better3
Update frequencyMonthly — betterEvery 2 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPadiPhone, iPad, Apple Watch — better
Requires iOS26.017.0 — better
Further details — not scored
Size18 MB7 MB
Age rating4+4+
DeveloperAmin MahpourRAYCREST SOFTWARE LLC

Customer experience

Plasmids X

All ratings7 ratings
Positive57.1%
Neutral14.3%
Negative28.6%
Written reviews3 reviews
Positive33.3%
Neutral0.0%
Negative66.7%

RayCrest Lab Calculator

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

14 purchases

Plasmids X

Subscriptions2
  • Monthly3 Days trial$1.991 Month
  • Yearly3 Days trial$9.991 Year
One-time12
  • A cup of coffee!$1.99
  • Split View Support$1.99
  • Manual Cloning$3.99
Show 9 more
  • In-silico PCR Support$3.99
  • NCBI Entrez Support$3.99
  • Local Alignment Support$3.99
  • A box of joe!$4.99
  • BLAST Support$4.99
  • ApE File Support$4.99
  • Genbank Support$4.99
  • dna File Support$5.99
  • All Features$24.99
None

RayCrest Lab Calculator

No in-app purchases

Questions

Is Plasmids X free?
Plasmids X is free to download, with in-app purchases available.
Is RayCrest Lab Calculator free?
RayCrest Lab Calculator is free to download, with no in-app purchases.
Which has better reviews, Plasmids X or RayCrest Lab Calculator?
RayCrest Lab Calculator is rated higher. Plasmids X averages 3.4 out of 5 from 7 ratings, while RayCrest Lab Calculator averages 4.7 from 3 ratings.
Do Plasmids X or RayCrest Lab Calculator have ads?
Neither Plasmids X nor RayCrest Lab Calculator shows ads.
Which is updated more often, Plasmids X or RayCrest Lab Calculator?
Plasmids X ships an update monthly, and RayCrest Lab Calculator every 2 months. Most recently, Plasmids X was updated on October 9, 2026 and RayCrest Lab Calculator on October 10, 2026.

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